CN-224228799-U - Thermo-acoustic power generation system

Abstract

The utility model provides a thermoacoustic power generation system capable of reducing performance deterioration caused by viscous loss in a resonance tube. The thermoacoustic power generation system includes a linear generator having a piston that vibrates back and forth in a cylinder to convert acoustic energy into electric energy, an annular pipe connected to the linear generator through a resonance pipe, and a prime mover that is disposed in the annular pipe and includes a cooler, a heat accumulator, and a heater that are disposed in order, the resonance pipe having an expanded pipe portion that is located at a position in the resonance pipe where a fluid velocity is maximum, the position corresponding to an antinode representing an amplitude of the fluid velocity, the expanded pipe portion including an expanded diameter portion and a contracted diameter portion, the contracted diameter portion being located between the expanded diameter portion and the linear generator, an inner diameter of the expanded diameter portion increasing in a direction from the annular pipe toward the linear generator, and an inner diameter of the contracted diameter portion decreasing in the direction.

Inventors

• OHTSUKI KOJI

Assignees

• 本田技研工业株式会社

Dates

Publication Date

20260512

Application Date

20250707

Claims (4)

1. 1. A thermoacoustic power generation system, comprising: a linear generator having a piston that vibrates back and forth within a cylinder to convert acoustic energy into electrical energy; a ring pipe connected to the linear generator through a resonance pipe, and The prime motor is arranged in the annular pipe and comprises a cooler, a heat accumulator and a heater which are arranged in sequence, The resonator tube has an expanded tube portion, The expansion pipe portion is located at a position where a fluid velocity within the resonance pipe is maximum, the position corresponding to an antinode to represent an amplitude of the fluid velocity, The expansion pipe part comprises an expansion part and a reduction part, the reduction part is positioned between the expansion part and the linear generator, the inner diameter of the expansion part is gradually increased along the direction from the annular pipe to the linear generator, and the inner diameter of the reduction part is gradually reduced along the direction.
2. 2. The thermoacoustic power generation system according to claim 1, wherein, The center of the expanded tubular section corresponds to the center of the amplitude.
3. 3. The thermoacoustic power generation system according to claim 2, wherein, The expansion pipe part comprises a plane part which is positioned between the diameter expansion part and the diameter reduction part, The planar portion corresponds to the antinode of the amplitude.
4. 4. A thermoacoustic power generation system according to any one of claims 1 to 3, characterized in that, The connection position of the linear generator and the resonance tube corresponds to a node of the amplitude.

Description

Thermo-acoustic power generation system Technical Field The present utility model relates to a power generation system, and more particularly, to a thermo-acoustic power generation system. Background In recent years, research and development have been conducted to provide energy efficiency in order to ensure reliable, sustainable and advanced energy access affordable to more people. In the prior art, a thermo-acoustic generator is proposed, which is capable of converting thermal energy from a prime mover into mechanical energy in the form of sound waves, driving a piston of a linear generator to reciprocate along its own central axis, thereby causing the linear generator to convert the mechanical energy into electrical energy for output. However, in the thermoacoustic power generation system of the related art, the length of the resonance tube disposed between the prime mover and the linear generator may reach several meters depending on the target frequency, which may aggravate viscous loss and cause a decrease in power output. Therefore, it is an important subject to develop a structure for improving the power generation efficiency of a thermoacoustic power generator. Disclosure of utility model The utility model provides a thermoacoustic power generation system capable of reducing performance deterioration caused by viscous loss in a resonance tube. According to an embodiment of the utility model, a thermoacoustic power generation system includes a linear generator having a piston that vibrates back and forth in a cylinder to convert acoustic energy into electric energy, an annular tube connected to the linear generator through a resonance tube, and a prime mover disposed in the annular tube and including a cooler, a regenerator, and a heater disposed in this order, the resonance tube having an expanded tube portion located at a position in the resonance tube where a fluid velocity is maximum, the position corresponding to an antinode representing an amplitude of the fluid velocity, the expanded tube portion including an expanded diameter portion and a reduced diameter portion, the expanded diameter portion being located between the expanded diameter portion and the linear generator, an inner diameter of the expanded diameter portion increasing in a direction from the annular tube toward the linear generator, and an inner diameter of the reduced diameter portion decreasing in the direction. In an embodiment according to the utility model, the center of the expansion tube portion corresponds to the center of the amplitude. In an embodiment according to the utility model, the dilating tube portion comprises a planar portion located between the enlarged diameter portion and the reduced diameter portion, the planar portion corresponding to the antinode of the amplitude. In an embodiment according to the utility model, the connection position of the linear generator to the resonator tube corresponds to a node of the amplitude. In view of the above, in the thermo-acoustic power generation system according to the present utility model, the expansion pipe portion is provided at a position of the resonance pipe corresponding to an antinode of the velocity amplitude where the fluid velocity is maximum. By expanding the tube portion, dynamic pressure energy at the position of the resonance tube where the fluid velocity is maximum can be converted into static pressure energy to reduce the flow velocity, so as to suppress the viscous loss. Therefore, the thermoacoustic power generation system can reduce performance deterioration caused by viscous loss in the resonance tube. In order to make the above features and advantages of the present utility model more comprehensible, embodiments accompanied with figures are described in detail below. Drawings FIG. 1 is a schematic diagram of a thermoacoustic power generation system according to an embodiment of the present utility model; Fig. 2 shows the correspondence of the resonator tubes of fig. 1 with fluid velocity, fluid pressure, expansion angle, and expansion area ratio. Reference numerals illustrate: 10 Linear generator 11 Piston 12 Cylinder body 13 Pressure vessel 100:Thermoacoustic power generation system 110 Annular tube 120 Prime mover 121 Heat accumulator 122 Cooler 123 Heater 130 Resonance tube 132 Expansion tube portion 1321 Expanded diameter portion 1322 Diameter-reducing portion 1323 Plane part 132A antinode CL coil D, direction PM, permanent magnet. Detailed Description Fig. 1 is a schematic diagram of a thermoacoustic power generation system according to an embodiment of the present utility model. Referring to fig. 1, in the present embodiment, a thermo-acoustic power generation system 100 includes a linear generator 10, an annular tube 110, a prime mover 120, and a resonance tube 130. In the present embodiment, the annular tube 110 encloses a working gas. As shown in fig. 1, in the present embodiment, the prime mover 120 is disposed in the annular tube 110